IDEIntf: remove abstract base methods from TSourceEditorWindowInterface, deprecated implementations were removed earlier.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45880 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: remove one more deprecated method TSourceNotebook.ClearErrorLines.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45881 4005530d-fff6-0310-9dd1-cebe43e6787f